A three-electrode ceramic gas discharge tube module for AC 6kA freewheeling interruption

Abstract

The present invention relates to a three-pole ceramic gas discharge tube module for interrupting 6kA AC freewheeling current. A three-pole ceramic gas discharge tube is disposed between an electromagnetic release and a first terminal. The three-pole ceramic gas discharge tube is provided with an electrode lead and is connected in series to the electromagnetic release via the electrode lead. One end face of the three-pole ceramic gas discharge tube is connected to a first contact piece on the first terminal, and the other end face of the three-pole ceramic gas discharge tube is connected to a yoke of the electromagnetic release. The module has the beneficial effect of providing a lightning current discharge channel including the three-pole ceramic gas discharge tube, while also taking into account a component that immediately interrupts subsequent power frequency current after a lightning current. The module has an interruption capacity of up to 6kA and is suitable for most power frequency power applications. This module significantly improves the defects of traditional three-pole ceramic gas discharge tubes, maximizes the lightning protection characteristics of the ceramic gas discharge tubes, and makes the greatest contribution to lightning protection and disaster reduction, and improves economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit equipment, and in particular to a three-pole ceramic gas discharge tube module for AC 6kA freewheeling interruption. Background Art

[0002] Lightning or overvoltage and overcurrent in power systems, electromagnetic pulse disturbances, etc., are all special natural weather phenomena or complex electromagnetic pulses generated in characteristic environments. They are an important cause of damage to power electronic equipment. Such situations always threaten the safe and stable operation of electric power and electronic information systems in various fields such as construction, railways, aviation, communications, industrial control, and military. Installing lightning protection components in the above electric power and electronic information systems: three-pole ceramic gas discharge tube components with 6kA power frequency (255VAC) continuous current interruption capability to provide overvoltage and overcurrent protection for the above systems has always been the direction of effort and exploration of scientific and technological workers.

[0003] Currently, the industry can only manufacture protectors containing traditional ceramic gas discharge tubes (GCDTs) with a continuous current interruption capacity of approximately 300A at the power frequency (255VAC). These protectors can only be used for lightning protection and overvoltage protection of N-PE lines. Lightning strikes cause the GCDT to short-circuit, effectively diverting the lightning current underground. However, this also short-circuits the power frequency current in the line. Failure to promptly interrupt the subsequent power frequency current can cause the lightning protection component itself to explode, burning the line distribution box and surrounding areas, resulting in significant personal and property damage. Summary of the Invention

[0004] (1) Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a circuit lightning protector with an AC 6kA freewheeling current interruption capability. It solves the technical problem that existing protectors containing traditional ceramic gas discharge tubes and triodes can only achieve a technical level of about 300A freewheeling current interruption capability at the power frequency (255VAC) and can only be applied to lightning protection and overvoltage protection of N-PE lines.

[0006] (2) Technical solution

[0007] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] The present invention also provides a three-pole ceramic gas discharge tube module for AC 6kA freewheeling interruption, comprising a base body with a mounting clip at the lower end and a cover body adapted for the base body, a handle installed in the base body, and a mechanical locking device connected to the handle at the upper end. The lower end of the mechanical locking device is provided with a moving contact rod, the moving contact rod is provided with a moving contact, the lower end of the mechanical locking device is provided with an electromagnetic release, a first terminal and a second terminal are provided on both sides of the electromagnetic release, a three-pole ceramic gas discharge tube is provided between the electromagnetic release and the first terminal, the three-pole ceramic gas discharge tube is provided with an electrode lead and is connected to the electromagnetic release in series via the electrode lead, one end face of the three-pole ceramic gas discharge tube is connected to a first contact piece on the first terminal, and the other end face of the three-pole ceramic gas discharge tube is connected to a yoke of the electromagnetic release, an arc extinguishing chamber is provided at the lower end of the electromagnetic release, the arc extinguishing chamber is connected to a static contact piece installed on the second terminal via an arc extinguishing electrode piece provided at its lower end, and the static contact piece is provided with a static contact.

[0009] Preferably, the triode ceramic gas discharge tube has an asymmetric structure.

[0010] Preferably, the three-electrode ceramic gas discharge tube includes a first porcelain tube, a second porcelain tube, a first electrode, a second electrode and a third electrode, the second electrode is arranged between the first porcelain tube and the second porcelain tube, the first electrode and the third electrode are respectively arranged on the outside of the first porcelain tube and the second porcelain tube, a first gap is formed between the first electrode and the second electrode, and a second gap is formed between the second electrode and the third electrode.

[0011] Preferably, the side surfaces of the first electrode and the second electrode sheet and the two side surfaces of the second electrode are all convexly formed to form discharge emission surfaces, and the discharge emission surfaces are electron emission material coatings.

[0012] Preferably, a protrusion is provided on the outer side of the second electrode, and the protrusion is connected to the electrode lead.

[0013] Preferably, the movable contact and the static contact are spaced apart from each other and opposite to each other, and contact shields are provided on both sides of the movable contact and the static contact.

[0014] Preferably, terminal installation chambers are provided on both sides of the seat body, a locking mechanism chamber, a trip chamber and an arc extinguishing space are provided between the two terminal installation chambers from top to bottom, and a contact space is further provided adjacent to the trip chamber.

[0015] Preferably, the arc extinguishing chamber includes two mounting plates and more than two arc pieces provided with V-shaped grooves, and the arc pieces are arranged at equal intervals between the mounting plates.

[0016] (3) Beneficial effects

[0017] The beneficial effects of the present invention are as follows: the three-pole ceramic gas discharge tube module for interrupting 6kA AC freewheeling current of the present invention provides a lightning current discharge channel including a three-pole ceramic gas discharge tube, while also taking into account a component that immediately interrupts subsequent power frequency current after the lightning current. The interruption capacity is as high as 6kA, which is suitable for most power frequency power applications. It greatly improves the defects of traditional three-pole ceramic gas discharge tubes, maximizes the lightning protection characteristics of ceramic gas discharge tubes, and makes the greatest contribution to lightning protection and disaster reduction and improved economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 2 A three-dimensional diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 3 is an internal structure diagram in an embodiment of the present invention;

[0021] Figure 4 An exploded view of the overall structure of an embodiment of the present invention;

[0022] Figure 5 A half-section diagram of a triode ceramic gas discharge tube in an embodiment of the present invention;

[0023] Figure 6 2 is a structural diagram of the arc extinguishing chamber in an embodiment of the present invention.

[0024] [Description of Reference Numerals]

[0025] 1. Moving contact; 2. Arc extinguishing chamber; 201. Mounting plate; 202. Arc plate; 203. V-shaped groove; 3. Magnetic rod; 4. Magnetic coil; 5. Three-pole ceramic gas discharge tube; 6. Base; 7. Cover; 8. Mechanical locking device; 81. Handle; 9. Moving contact rod; 91. Moving contact; 10. Electromagnetic release; 11. First terminal; 12. Second terminal; 130. First porcelain tube; 131. Second porcelain tube; 132. First electrode; 13 3. Second electrode; 134. Third electrode; 135. First gap; 136. Second gap; 137. Discharge emission surface; 138. Protrusion; 14. Electrode lead; 15. First contact piece; 16. Yoke; 18. Static contact piece; 19. Static contact; 20. Arc-extinguishing electrode piece; 21. Contact guard; 28. Terminal installation chamber; 23. Locking mechanism chamber; 24. Trip unit chamber; 25. Arc-extinguishing space; 26. Contact space; 27. Mounting clip. DETAILED DESCRIPTION

[0026] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] See also Figures 1 to 6 The present invention provides a three-pole ceramic gas discharge tube module for AC 6kA freewheeling interruption, comprising a base body 6 with a mounting clip 27 at the lower end and a cover body 7 adapted to the base body 6, a handle 81 installed in the base body 6, and a mechanical locking device 8 connected to the handle 81 at the upper end. The mechanical locking device 8 is a prior art structure commonly used in circuit breakers. A moving contact rod 9 is provided at the lower end of the mechanical locking device 8, and the moving contact rod 9 is provided with a moving contact 91. An electromagnetic release 10 is provided at the lower end of the mechanical locking device 8. The magnetic moving rod 3 on the electromagnetic release 10 separates the moving contact 91 on the moving contact rod 9 from the static contact 19 under the action of the magnetic coil 4 to cut off the current. First contact 19 is provided on both sides of the electromagnetic release 10. A wiring terminal 11 and a second wiring terminal 12, a three-pole ceramic gas discharge tube 5 is arranged between the electromagnetic release 10 and the first wiring terminal 11, the three-pole ceramic gas discharge tube 5 is provided with an electrode lead 14 and is connected to the electromagnetic release 10 in series through the electrode lead 14, one end face of the three-pole ceramic gas discharge tube 5 is connected to the first contact piece 15 on the first wiring terminal 11, and the other end face of the three-pole ceramic gas discharge tube 5 is connected to the yoke 16 of the electromagnetic release 10, and an arc extinguishing chamber 2 is provided at the lower end of the electromagnetic release 10, and the arc extinguishing chamber 2 is connected to the static contact piece 18 installed on the second wiring terminal 12 through the arc extinguishing electrode piece 20 arranged at its lower end, and the static contact piece 18 is provided with a static contact 19.

[0028] In the embodiment of the present disclosure, the triode ceramic gas discharge tube 5 has an asymmetric structure.

[0029] In the embodiment of the present disclosure, the three-electrode ceramic gas discharge tube 5 includes a first porcelain tube 130, a second porcelain tube 131, a first electrode 132, a second electrode 133 and a third electrode 134. The second electrode 133 is arranged between the first porcelain tube 130 and the second porcelain tube 131. The first electrode 132 and the third electrode 134 are respectively arranged on the outside of the first porcelain tube 130 and the second porcelain tube 131. A first gap 135 is formed between the first electrode 132 and the second electrode 133, and a second gap 136 is formed between the second electrode 133 and the third electrode 134.

[0030] In the embodiment of the present disclosure, the side surfaces of the first electrode 132 and the second electrode 133 and the two side surfaces of the second electrode 133 are all convexly provided to form a discharge emission surface 137. The discharge emission surface 137 is a coating of electron emission material. The material of the discharge emission surface 137 used in this solution is a composite material of 80% powder metallurgy tungsten and 20% copper.

[0031] In the embodiment of the present disclosure, a protrusion 138 is provided on the outer side of the second electrode 133 , and the protrusion 138 is connected to the electrode lead 14 .

[0032] In the embodiment of the present disclosure, the moving contact 91 and the static contact 19 are spaced apart from each other and opposite to each other, and contact shields 21 are provided on both sides of the moving contact 91 and the static contact 19 .

[0033] In the embodiment of the present disclosure, terminal installation chambers 28 are provided on both sides of the base body 6, and a locking mechanism chamber 23, a trip chamber 24 and an arc extinguishing space 25 are provided between the two terminal installation chambers 28 from top to bottom, and a contact space 26 is also provided adjacent to the trip chamber 24.

[0034] In the embodiment of the present disclosure, the arc extinguishing chamber 2 includes two mounting plates 201 and two or more arc pieces 202 provided with V-shaped grooves 203 , and the arc pieces 202 are arranged at equal intervals between the mounting plates 201 .

[0035] According to the working principle of "pass direct current and block alternating current": lightning is a high-frequency pulse current wave, and its path goes through the three-pole ceramic gas discharge tube to the normally closed moving and static contacts, and does not go through the magnetic coil; the direct current (AC 50Hz is similar to direct current) path goes through the three-pole ceramic gas discharge tube to the magnetic coil and then to the normally closed moving and static contacts. The arcs generated by the above paths are all eliminated in the arc extinguishing chamber.

[0036] In summary, this technical solution provides a lightning current discharge channel including a three-pole ceramic gas discharge tube, while also taking into account the component that immediately interrupts the subsequent power frequency current after the lightning current. The interruption capacity is as high as 6kA, which is suitable for most power frequency power applications. It greatly improves the defects of traditional three-pole ceramic gas discharge tubes, maximizes the lightning protection characteristics of ceramic gas discharge tubes, and makes the greatest contribution to lightning protection and disaster reduction and improved economic benefits.

[0037] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person of ordinary skill in the art cannot change, modify, replace or modify the above embodiments within the scope of the present invention.

Claims

1. A three-pole ceramic gas discharge tube module for AC 6kA continuous current interruption, comprising a base (6) with a mounting clip (27) at the lower end, a cover (7) adapted to the base (6), a handle (81) installed in the base (6), and a mechanical locking device (8) connected to the handle (81) at the upper end, wherein the lower end of the mechanical locking device (8) is provided with a movable contact rod (9), and the movable contact rod (9) is provided with a movable contact point (91), characterized in that: An electromagnetic release (10) is provided at the lower end of the mechanical locking device (8), the electromagnetic release (10) comprising a magnetic rod (3) and a magnetic coil (4), a first wiring terminal (11) and a second wiring terminal (12) are provided on both sides of the electromagnetic release (10), a three-pole ceramic gas discharge tube (5) is provided between the electromagnetic release (10) and the first wiring terminal (11), the three-pole ceramic gas discharge tube (5) comprising a first electrode (132), a second electrode (133) and a third electrode ( 134), the second electrode (133) is arranged between the first electrode (132) and the third electrode (134), a first gap (135) is formed between the first electrode (132) and the second electrode (133), a second gap (136) is formed between the second electrode (133) and the third electrode (134), a protrusion (138) is provided on the outside of the second electrode (133), the protrusion (138) is connected to the electrode lead (14), and the triode ceramic gas discharge tube (5) is connected to the electrode lead (14) through the protrusion (138). The pole lead (14) is connected in series to the magnetic coil (4) in the electromagnetic release (10), one end face of the three-pole ceramic gas discharge tube (5) is connected to the first contact piece (15) on the first terminal (11), and the other end face of the three-pole ceramic gas discharge tube (5) is connected to the yoke (16) of the electromagnetic release (10), and the lower end of the electromagnetic release (10) is provided with an arc extinguishing chamber (2), and the arc extinguishing chamber (2) includes two mounting plates (201) and two or more V-shaped grooves (2 03), arc pieces (202) are arranged equidistantly between the mounting plates (201), the arc extinguishing chamber (2) is connected to a static contact piece (18) mounted on a second terminal (12) via an arc extinguishing electrode piece (20) arranged at its lower end, the static contact piece (18) is provided with a static contact (19), and the magnetic moving rod (3) on the electromagnetic release (10) separates the moving contact (91) on the moving contact rod (9) from the static contact (19) under the action of the magnetic coil (4) to cut off the current.

2. The three-electrode ceramic gas discharge tube module for interrupting 6kA AC freewheeling current according to claim 1, characterized in that: The triode ceramic gas discharge tube (5) has an asymmetric structure.

3. The three-electrode ceramic gas discharge tube module for interrupting 6kA AC freewheeling current according to claim 1, characterized in that: The triode ceramic gas discharge tube (5) further comprises a first porcelain tube (130) and a second porcelain tube (131); a second electrode (133) is provided between the first porcelain tube (130) and the second porcelain tube (131); and the first electrode (132) and the third electrode (134) are respectively provided on the outside of the first porcelain tube (130) and the second porcelain tube (131).

4. The three-electrode ceramic gas discharge tube module for interrupting 6kA AC freewheeling current according to claim 1, characterized in that: The side surfaces of the first electrode (132) and the second electrode (133) sheets, as well as the two side surfaces of the second electrode (133), are all convexly provided to form a discharge emission surface (137), and the discharge emission surface (137) is an electron emission material coating.

5. The three-electrode ceramic gas discharge tube module for interrupting 6kA AC freewheeling current according to claim 1, characterized in that: The movable contact (91) and the static contact (19) are spaced apart from each other and face each other, and contact shields (21) are provided on both sides of the movable contact (91) and the static contact (19).

6. The three-electrode ceramic gas discharge tube module for interrupting 6kA AC freewheeling current according to claim 1, characterized in that: Terminal installation chambers (22) are provided on both sides of the base body (6), a locking mechanism chamber (23), a trip chamber (24) and an arc extinguishing space (25) are provided between the two terminal installation chambers (22) from top to bottom, and a contact space (26) is also provided adjacent to the trip chamber (24).

Images